Finding the Fourth Proportional to 142,820.42, 214,381.38 and 139,603.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,820.42 : 214,381.38 = 139,603.47 : x
2. Step 2: Convert to fraction form
   142,820.42/214,381.38 = 139,603.47/x
3. Step 3: Cross multiply
   142,820.42x = 214,381.38 × 139,603.47
4. Step 4: Simplify right side
   142,820.42x = 29,928,384,551.39
5. Step 5: Solve for x
   x = 29,928,384,551.39/142,820.42
6. Step 6: Final answer
   x = 209,552.56